With all the numerous sites popping up using bitcoin wallets what if there was a service that let you deposit your online coins at a multitude of sites and use them to spend online by withdrawing the amount you need evenly ?

Just say you had 50 bitcoins. Wouldnt it be wise to have 50 wallet providers each holding 1 bitcoin rather than 1 ewallet that holds 50 ?

Would that lessen the risk of losing all your coins to a site that got taken down ?